Marine Soundscapes: Noise Pollution and Animal Welfare

Ocean noise pollution from shipping, sonar, and energy exploration disrupts marine animal communication, navigation, and feeding, causing significant welfare harm across species from fish to whales.

Key Facts

Ocean ambient noise levels have increased by approximately 12 dB (16x) since the mid-20th century from shipping traffic.
Military sonar at 235 dB causes beaked whale strandings through hemorrhage and disorientation.
Fish exposed to high noise levels show elevated cortisol, impaired hearing, and altered schooling behavior.
Shipping noise reduces effective communication distance for whales by 90% compared to pre-industrial baselines.
Seismic air gun surveys for oil exploration produce sounds detectable across ocean basins and cause mass zooplankton mortality.

Welfare Considerations

Ocean noise pollution creates welfare harm ranging from behavioral disruption through chronic stress to acute mortality. Military sonar strandings represent dramatic welfare events with well-documented causation. The more pervasive welfare harm is chronic: whales unable to communicate effectively for mating, feeding coordination, and social bonding; fish unable to detect predators through sound; invertebrates disrupted by substrate vibration from shipping. Practical interventions include shipping speed reduction, route modification around critical habitat, and sonar use restrictions in areas with vulnerable cetaceans.

What You Can Do

Support international shipping noise reduction requirements under IMO frameworks.
Advocate for sonar use restrictions in areas with endangered cetacean populations.
Follow the Acoustic Ecology Institute for ocean noise research and advocacy.
Support seismic survey restrictions near critical marine mammal habitats.
Choose seafood from fisheries that have assessed and minimized acoustic impact.